| Ischnochiton(noun, creature, geohistory, appearance, eocene) |
| Leontiniidae(noun, creature, geohistory, appearance, eocene) |
| Leptocyon(noun, animal, creature, geohistory, appearance) |
| Leptomerycinae(noun, creature, geohistory, appearance, eocene) |
| Leptomeryx(noun, creature, geohistory, appearance, eocene) |
| Limnocyon(noun, creature, geohistory, appearance, eocene) |
| Lobocarcinus(noun, creature, geohistory, appearance, eocene) |
| Machaeroides(noun, creature, geohistory, appearance, eocene) |
| Macraucheniidae(noun, creature, geohistory, appearance, eocene) |
| Megalonychidae(noun, animal, creature, geohistory, appearance) |
| Megatheriidae(noun, animal, creature, geohistory, appearance) |
| Merycoides(noun, animal, creature, geohistory, appearance) |
| Merycoidodontoidea(noun, creature, geohistory, appearance, eocene) |
| Mesocyon(noun, animal, creature, geohistory, appearance) |
| Mesonyx(noun, creature, geohistory, appearance, eocene) |
| Mesotheriidae(noun, creature, geohistory, appearance, eocene) |
| Miohippus(noun, creature, geohistory, appearance, eocene) |
| Myophiomyidae(noun, animal, creature, geohistory, appearance) |
| Nanotragulus(noun, creature, geohistory, appearance, eocene) |
| Nimravus(noun, animal, creature, geohistory, appearance) |